Thebmostatic steam-tbap



D. N. CROSTHWAIT. JR.

THERMOSTATIC STEAM TRAP.

APPLICATION FILED sEPT.23,191a.

Patented Sept. 9, 1919.

DAVID NELSON CROSTHWAIT, JR., 0F MARSHALLTOWN, IOWA.

THERMOSTATIC STEAM-TRAP.

Specication of Letters Patent.

Patented Sept. 9, 1919.

Application led September 23, 1918. Serial No. 255,398.

To all/whom it may concern:

Be it known that I, DAVID N. CnosTHwAiT, Jr., a citizen of the United States, and a resident of Marshalltown, in the county of Marshall and State o'Iowa, have invented certain new and useful Improvements in Thermostatic Stea1n-Traps, of which the following is a specification.

My invention is an improvement in thermostatic steam traps, and has for its object to provide a device of the character specified wherein the proportionate amount of water of condensation passed by the trap is constant, under varying conditions of temperature or pressure, and wherein the rate of flow may be increased with an increase of pressure and a uniorm or graduated opening may be provided for the same drop in temperature between that corresponding to the ressure of the steam and the temperature of the water of condensation' entering the trap.

In the drawings:

Figure 1 is a vertical section through the improved trap;

Fig. 2 is a partial section at right angles to Fig. 1.

In the embodiment of the invention shown a substantially cylindrical casing is provided, consisting of a body 1 and a cover 2,

` the cover having an externally threaded andepending nipple nular flange 3 which fits within the top of the body and has threaded engagement therewith.

The body has a lateral nipple 4 for connection with the apparatus to be drained, by means of a union 5, and the body has also a 6 for connection with a discharge pipe. A valve seat 7 is provided between the nipple and the body of the casing, and with this seat cooperates a valve 8 which is the segment of a sphere, the upper end of the seat being rounded to fit the valve.

This valve has a stem 9 which connects it with a frame 10 arranged within a hollow casing 11, the said casing being sectional, and the sections have threaded engagement as shown, to permit access t0 the interior of the said second casing.

An expansible and contractible container 12 lis arranged betwen the casing 11 and a disk 13 which is secured to the cover in a manner to be presently described, the container 12 being connected at one end to the disk and at its other end to the casing 11.

The connection with the casing 11 is made by Hanges 14 on the sections of the casing which clamp the end of the container 12 between them. This casing 11 has an opening 1n its bottom through which the stem 9 extends, and it has a nipple 15 at its top which shda-bly engages the stem 16 which supports the disk 13. This stem, as shown, has its upper end threaded into an openin in the cover 2, and the stem is hollow, the ollo w of the stem communicating with the nipple 15, and this nipple has lateral openings 16 opening into the interior of the contalner 12.

An expansible and contractible container 17 is arran ed within the frame 10, the said contamer aving one end connected with the upper end'of the frame 10, as indicated at 18, While the lower end is connected to a nipple 19. The lower end of the nipple 19 is connected to a bridge 20.

This bridge has its ends received between the sections of the casing 11, and the said ends of the bridge are clamped between the sections, the bridge being thus held rigidly. The bridge has slots or openings, through which the side members of the frame 10 extend, and the bridge serves as a guide for the frame in its vertical movement and as a stay for the lower end of the expansible and contractible casing 17.

In use, when the mntainer 12 expands, tending to close the valve, the container 17 will move the valve in the opposite direction, thereby keeping the pressure on the valve seat uniform. The extent of the valve opening may be maintained uniform, or it may be graduated, depending upon the physical properties of the fluids used,

The shape of the expansible and contractible heat conducting containers might be changed.

The fluids used in the different thermostats mfight be such that they have a diferent coe cient of expansion or the quantity of fluid used might be varied to give the proper expansion. v

I claim:

1. A device of the character specified, comprising a casing adapted for connection with the apparatus to be drained and with the discharge pipe, said casing having a valve seat at the discharge pipe, a valve cooperating with the seat, and heat controlled elements in connection with the valve for moving it in opposite directions and having different coefiicients of expansion, one of said elements carrying a closed easing, the other of the said elements being arranged Within the said casing, the last named heat controlling element being connected at one end to the valve and at the other to the last named casing.

2. A device of the character specified comprising a casing for connection With the apparatus to be drained, the casing having a valve controlled discharge port, heat controlled elements connected with the valve and with the casing for moving the valve in opposite directions, the said elements being fluid filled containers and the fluids in the several containers havingdierent coi said fluids in the casings having different coefiicients of expanslon, each expanslble andl contractible casing having one end connected to the valve or to the rst named casing, and a connection between the other ends of the said casings.

DAVID NELSON cnosrnwirr, JR.

WVitnesses:

WILLIAM A. WALDER, ANDREW C. WALDER. 

